A good thermometer is in thermal contact with system A and doesn\'t exchange ene

Question

A good thermometer is in thermal contact with system A and doesn't exchange energy with system A. And the same thermometer is then Placed in thermal contact with system B and doesn't exchange energy with system B. we expect energy to flow from system A to system B if they are placed in thermal contact? Yes, it contacted A first No, A and B both have the same temperature as the thermometer Not enough information (energy might go to A or it might go from A) You have 10^20 molecules of gas in a 3d box with temperature T = 300K. Which is so cold the molecules can't rotate. What does the equip say about the total energy? kE = 1/2k_BT KE = 10^20k_BT KE = 3/2 10^20k_BT KE = 3kBT None of the above Some heat flowed into a gas while the gas does some work. Does the temperature of the gas increase? Yes, heat flowed in No, work was done Not enough information Why does a boat float? The weight of the water displaced equals the weight of the boat The weight of the water displaced exceeds the weight of the boat The weight of the boat exceeds the weight of the water displaced

Explanation / Answer

5) A and B are in thermal equilibrium with thermometer

that means A and B are also on thermal equilibrium. hence no energy flow.

Ans(B)

6) energy = 3 kb T /2 per molecule

= 3/2 10^20 k_B T

Ans (C)

7. (C)

8. Fnet = buoyant force - weight force = 0

buoyant force = weight force

buoyant force is the weight of water displaced by boat.

hence weight of water displaced equals the weight of the boat.

Ans(A)

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